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ESB-2016.0574 - [Win][Linux][Virtual][AIX] IBM OS Images: Multiple vulnerabilities

Date: 04 March 2016
References: ASB-2016.0004  ESB-2016.0552  ESB-2016.0556  ASB-2016.0018.2  ESB-2016.0569  ESB-2016.0570  ESB-2016.0607  ESB-2016.0609  ESB-2016.0643  ESB-2016.0668  


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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0574
 Security Bulletin: Multiple vulnerabilities in IBM Java SDK affect IBM OS
   Images for Red Hat Linux Systems, IBM OS Images for AIX, and Windows.
       (CVE-2015-5041, CVE-2015-7575, CVE-2015-7981, CVE-2015-8126,
                    CVE-2015-84= 72, and CVE-2015-8540)
                               4 March 2016

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM OS Images
Publisher:         IBM
Operating System:  AIX
                   Linux variants
                   Windows
                   Virtualisation
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated      
                   Access Privileged Data          -- Remote with User Interaction
                   Denial of Service               -- Remote/Unauthenticated      
                   Provide Misleading Information  -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-8540 CVE-2015-8472 CVE-2015-8126
                   CVE-2015-7981 CVE-2015-7575 CVE-2015-5041

Reference:         ASB-2016.0018
                   ASB-2016.0004
                   ESB-2016.0570
                   ESB-2016.0569
                   ESB-2016.0556
                   ESB-2016.0552

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=swg21978169

- --------------------------BEGIN INCLUDED TEXT--------------------

Security Bulletin: Multiple vulnerabilities in IBM Java SDK affect IBM OS 
Images for Red Hat Linux Systems, IBM OS Images for AIX, and Windows. 
(CVE-2015-5041, CVE-2015-7575, CVE-2015-7981, CVE-2015-8126, CVE-2015-8472, 
and CVE-2015-8540)

Document information

More support for:

PureApplication System

Software version:

2.0, 2.0.0.1, 2.1.0.0, 2.1.0.1, 2.1.0.2, 2.1.1.0, 2.1.2.0, 2.1.2.1

Operating system(s):

AIX, Linux, Windows

Reference #:

1978169

Modified date:

2016-03-02

Security Bulletin

Summary

There are multiple vulnerabilities in IBM SDK Java Technology Edition, Version
6 and 7, that is used by IBM OS Images for Red Hat Linux Systems, AIX, and 
Windows. These issues were disclosed as part of the IBM Java SDK updates in 
January 2016 and includes the vulnerability commonly referred to as SLOTH.

Vulnerability Details

CVEID: CVE-2015-5041

DESCRIPTION: A flaw in the IBM J9 JVM allows code to invoke non-public 
interface methods under certain circumstances. Untrusted code could 
potentially exploit this. This could lead to sensitive data being exposed to 
an attacker, or the attacker being able to inject bad data.

CVSS Base Score: 4.8

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/106719 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N)

CVEID: CVE-2015-7575

DESCRIPTION: The TLS protocol could allow weaker than expected security caused
by a collision attack when using the MD5 hash function for signing a 
ServerKeyExchange message during a TLS handshake. An attacker could exploit 
this vulnerability using man-in-the-middle techniques to impersonate a TLS 
server and obtain credentials. This vulnerability is commonly referred to as 
SLOTH.

CVSS Base Score: 7.1

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/109415 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/UI:U/C:H/I:L/A:N)

CVEID: CVE-2015-7981

DESCRIPTION: libpng could allow a remote attacker to obtain sensitive 
information, caused by an out-of-bounds read in the png_convert_to_rfc1123 
function. An attacker could exploit this vulnerability to obtain sensitive 
information.

CVSS Base Score: 5.3

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/107740 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

CVEID: CVE-2015-8126

DESCRIPTION: libpng is vulnerable to a buffer overflow, caused by improper 
bounds checking by the png_set_PLTE() and png_get_PLTE() functions. By 
persuading a victim to open a specially-crafted PNG file, a remote attacker 
could overflow a buffer and execute arbitrary code on the system.

CVSS Base Score: 7.8

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/108010 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/UI:U/C:H/I:H/A:H)

CVEID: CVE-2015-8472

DESCRIPTION: libpng is vulnerable to a buffer overflow, caused by improper 
bounds checking by the png_get_PLTE() and png_set_PLTE() functions. By 
persuading a victim to open a specially crafted PNG image, a remote attacker 
could overflow a buffer and execute arbitrary code on the system or cause the
application to crash.

CVSS Base Score: 6.3

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/109392 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/UI:U/C:L/I:L/A:L)

CVEID: CVE-2015-8540

DESCRIPTION: libpng is vulnerable to a buffer overflow, caused by a read 
underflow in png_check_keyword in pngwutil.c. By sending an overly long 
argument, a remote attacker could overflow a buffer and execute arbitrary code
on the system or cause the application to crash.

CVSS Base Score: 9.8

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/109219 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

IBM OS Image for Red Hat Linux Systems 3.0.0.0 and earlier.

IBM OS Image for AIX Systems 2.1.1.0 and earlier.

Remediation/Fixes

Virtual machines deployed from IBM PureApplication Systems are affected. This
includes RedHat Linux, AIX-based, and Windows-based deployments. The solution
is to apply the following IBM PureApplication System fix to the deployed 
virtual machines.

Java Update for Windows

http://www-933.ibm.com/support/fixcentral/swg/doSelectFixes?options.selectedFixes=Java_Update_Windows_Feb_2016

Java Update for Linux

http://www-933.ibm.com/support/fixcentral/swg/doSelectFixes?options.selectedFixes=Java_Update_Linux_Feb_2016

Java Update for AIX

http://www-933.ibm.com/support/fixcentral/swg/doSelectFixes?options.selectedFixes=Java_Update_AIX_Feb_2016

1. Import the fix into the Emergency Fix catalogue.

2. For deployed instances, apply this emergency fix on the VM.

3. Restart the deployed instance after the fix is applied.

Workarounds and Mitigations

For CVE-2015-7575:

Users of Java 7 and later can address the issue by updating the 
/jre/lib/security/java.security file as follows (both steps are required):

 Add MD5 to the jdk.certpath.disabledAlgorithms property - e.g. 
jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024, MD5

 Add MD5withRSA to the jdk.tls.disabledAlgorithms property - e.g. 
jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768, MD5withRSA

Java 6 requires code changes in the JSSE component in addition to the 
java.security file modifications, so upgrading the JDK is the only solution.

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alerts like this.

References

Complete CVSS v3 Guide

On-line Calculator v3

Related information

IBM Secure Engineering Web Portal

IBM Product Security Incident Response Blog

Acknowledgement

CVE-2015-7575 was reported to IBM by Karthikeyan Bhargavan at INRIA in Paris,
France

Change History

2 March 2016: Original version published

*The CVSS Environment Score is customer environment specific and will 
ultimately impact the Overall CVSS Score. Customers can evaluate the impact of
this vulnerability in their environments by accessing the links in the 
Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the 
Common Vulnerability Scoring System (CVSS) is an "industry open standard 
designed to convey vulnerability severity and help to determine urgency and 
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY 
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT 
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

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